Nail-making machine.



W. H. HART e LE. DoBsoN.

NAIL MAKINGl MACHINE. APPLIGATION FILEDJAN.14.1908.

Patented Feb. 8, 1910.

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W. H. HART L J. E. DOBSON. NAIL MAKING MAGHINE APPLICATION FILED JAN.14,1908.

Patented Feb; 8, 1910.

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Q/Vihwoow I W. H. HART e J. E. DOBSON. NAIL MAKING MAGHINE.

APPLICATION FILED JAN.14, 1908.

948,879?, Petented Feb. 8,1910.

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w om V) W. H. HART; J. E. DOBSON. NAIL MAKING MACHINE..

APPLICATION FILED M1114, 190s.

Patented Feb. 8, 1910.

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W. H. HART & J. E. DOBSON.

NAIL MAKING MACHINE.

APPLICATION FILED IAN.14, 1908.

6 SHEETS--SHBBT 5.

Patented Feb. 8, 1910.

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NAIL MAKING MACHINE.,

APPLICATION FILED JAN. 14, 1908.

948,879. Patented Feb.8, 1910.

6 SHEETS-SHEET 6.

Ilm l umm WILLIAM I-I'. HART, 0F BATTLE CREEK, AND JOHN E. IDOBSON, OFDETROIT, MICHIGAN, ASSIGNORS TO H. B. SHERMAN MANUFACTURING- COMPANY, OFBATTLE CREEK, MICHIGAN, A CORPORATION OF MICHIGAN.

NAIL-MAKING MACHINE.

Specification of Letters Patent.

Patented Feb. 8, 1910.

To all whom 'it may concern.

Be it known that we, llLLIAM H. HART, of Battle Creek, Calhoun county,Michigan, and JOHN E. DonsoN, of Detroit, lNayne county, Michigan, haveinvented certain new and useful Improvements in Nail-Making Machines;and we hereby declare that the following is a full, clear, and exactdescription thereof, reference being had to the accompanying drawings,which form part of this specification.

This invention is an improvement in nail making machines and isparticularly designed for making roofing nails having wire Shanks andlarge disk-like sheet metal heads.

The machine comprises mechanism for feeding the wire; dies for clampingthe wire after a. nail length has been advanced; means for feeding amet-al strap across the line of wire feed and in front of the end of thewire; means for punching a nail head from the strap, and driving it ontothe end of the wire, (the wire punching its way through the head) g andalso if desired, concave-corr veXing the head, means for s vaging theend of the wire to the head, and means for severing a nail length, withthe attached head, from the wire and for pointing the nail. Preferablythe wire is fed forward after the head is attached thereto, and the wirethen seifered; and the same dies which cut the wire also point the same.

The invention will be clearly understood from the following descriptionof the inachine illustrated in the accompanying drawings, whichrepresent the present preferred practical embodiment of the invention,such machine being adapted to turn out nails having cylindricalconcave-convex sheet or strap metal heads and barbed, or roughencd,

and pointed wire shanks.

In said drawings-Figure 1 is a top plan view of the complete machine.Fig. 2 is a side elevation thereof. Fig. 3 is a kcentral longitudinalvertical section thereof, some of the parts being shown in elevation.Fig. et is an enlarged sectional plan view of the die portion of themachine, showing parts in position just prior to the severance of thecompleted nail. Fig. 5 is a plan view with the blanking dies and thewire clamping dies closed. Fig. 6 is an enlarged detail sectional viewof the dies just prior to heading the nail. Fig. 7 is an enlargedhorizontal sectional view showing the position of the dies and headerrod after the completion of the heading operations. Fig. S is a detailperspective view of the wire clamping dies and the female blanking dieseparated. Fig. 9 is a. detail transverse section on line 9 9, Fig. 1.Fig. 10 is a side elevation of the strap feeding device removed from themachine. Fig. 11 is a plan view of one of the strap guide plates. Fig.12 is an enlarged sectional view of the wire feeding device on line12H12, Fig. 3. Fig. 13 is a horizontal sectional view of the strapfeeding device on line 13-13, Fig. 10. Fig. 111 is a detail transversesectional view showing the drive shaft and its cams. Fig. 15 is aperspective view of one of the completed nails.

The wire fw is fed in by means hereafter described through a wireclamping die composed of opposite similar parts 1, 1, (see F G, 7, 8,)mounted in blocks 1a and 1". Block 1b is fastened in a casting 1Xsecured to an upstanding bracket F1 on the main frame; and the block 121is slidably mounted in said casting and capable of movement to and fromblock 1" so as to open or close the die 1. As shown, block 1d isconnected by a link 1 to an oscillating lever l pivoted at l on the mainframe and in turn connected by a link 1p to a yoke 1c1 loosely supportedon shaft S and carrying rollers 1l' engaging opposite sides of aneccentric cam 1s attached tothe main shaft S (see Figs. 1 and 14). Bymeans of these parts the wire clamping die is opened and closed at theproper time.

The inner ends of the parts 1 of thc ,clamping die 1 are semi-cylindric,as shown at 1t and the extremity of this cylindric portion is preferablyconvex as shown at 1". Around this cylindric portion 1t of the clampingdie is removably mounted an annular female blanking die 2, the openingin which corresponds in form to the contour of the head of the nail,being preferably circular. The blanking die 2 has an annular flange 2which lits into corresponding recesses in the inner faces of blocks 1dand 1b, and secured thereto by means of plates 2" and 9.@ fastened tothe blocks by suitable screws. A sufficient play is left between theblanking die 2 and part 1t of the clamping die to allow the clamping dieto be opened and closed, this movement of the clamping dic being veryslight.

Arranged opposite and in axial alinement with the dies l and 2 is a maleblanking die 3, the end of which is adapted to enter the female blankingdie 2, and such end is preferably concaved opposite the convex portionlt of die l, so as to co-act therewith and impart a concavo-convex shapeto the nail head, as indicated in Figs. 4, G, 7. Die 3 is provided withan annular flange 3 fitted into a corresponding recess in a threadedboss 3b on a plate 3, which is secured to a cross head 5. The die 3 isdetachably attached to plate 3c by means of a cap-nut 3d screwed ontothe boss 3b (see Figs. 4, 5, 7 The cross head 5 is provided with sidebase fianges 5 engaging guides F2 on the frame, and this cross head isreciprocated in the guides by means of pitmen 5e pivotally connected tobolts 5d, which are adjustably connected to ears 5C on the cross head,and the pitmen 5e are also connected with eccentric bands 5f engagingcams 5s on the main shaft S (see Figs. 1l4). In this manner the crosshead and dies thereon are moved to and from the dies l and 2 at eachrevolution of the main shaft. Vithin the die 3 is a header rod 4 Whichoperates axially of the die 3 and is connected to a bar 4 which isguided in a box 5 on cross head 5, and bar 4a is connected at its rearend to a pitman 4b, which is preferably made extensible, as shown, andis connected to an eccentric box 4 engaging an eccentric 4s on shaft S,so that the header rod is reciprocated in and like the cross head, buthas a different time of movement, as hereinafter explained. A spring 3Xmay be placed upon the die 3 and project beyond the end thereofsufficiently to clear the strap S from the die 3 after each punchingoperation.

Opposite the line of Wire feed are cutting and pointing dies G, whichare removably attached to slides 6a, as shown in Figs. 4, 5, said slidesbeing mounted in boxes F 3 on the main frame and being reeiprocated bysuitable means. As shown, each slide is engaged by one arm of a cranklever 6 pivoted at Gd on the main frame, the other arm of said leverbeing connected by a rod 6e to a yoke Gf loosely embracing the shaft S,said yoke carrying a roller 6g engaging a race cam groove in a cam (isfast on shaft S, as shown. These parts are so timed that at the propermoment the cutting and pointing dies are advanced and sever a naillength of Wire.

rlhe Wire may be fed in any suitable manner. As shown, it is fed betweenrolls 7 mounted upon shafts 7a journaled in a bracket F4 attached to themain frame. The shafts 7a are provided With intermeshing gears 7b. @neof the shafts 7 is ex tended at one side, and to it is secured a handWheel 7c and a ratchet 7d, which ratchet is engaged by a dog 7e pivotedto one arm of a lever 7i loosely mounted on the shaft adjacent latchet7d, and the other arm of said lever is connected, as indicated in Figs.1 2, to a rod 7g Which is in turn connected to a slide 7h looselyresting on shaft S and provided with rollers 7 i, 7i, engaging a cam 7sattached to the shaft S (see Fig. 1 14). The rod 7 may be adjustablyconnected to arm 7" by means of a stud 7Jy adjustably secured in a slot7k in lever 7 f by a bolt 71, and by adjusting the pin 7J' in slot 7kthe throw of lever 7f can be changed so that any desired length of Wirecan be fed through the Wire clamping dies l at the time desired.

rl`he peripheries of rolls 7, 7, are serrated r deeply milled, as shown,so as to firmly bite the Wire and also roughen the edges j thereof, sothat the shanks of the completed nails will be roughened or barbed, asshown in Fig. l5.

Strap feed-The strap metal from Which the nail heads are formed may befed toward the line of Wire feed by any suitable means. iis shown thestrap s is led in over a grooved guide Wheel 8m j onrnaled on arms F7mounted on a casting FG attached to bracket F1. From VWheel 8m the strappasses between feeding' rolls 8 mounted upon shafts 8a jonrnaled insuitable bearings supported in castings FG. These shafts 8a haveintermeshing gears 8b and one of the shafts is extended at one side andcarries a ratchet 8, Which engages a dog 81 pivoted on the lever 8e hungupon shaft 8, and this lever is connected by a link 8f to an eccentricstrap 81' inclosing an eccentric 8s on shaft S. A friction brake 8g maybe applied to one of the shafts 8a (see Figs. 1 13) to prevent anynon-positive movement of the strap feeding rolls. Preferably the strapis fed down after the blanking dies have separated and before the nailis severed. The straps s after passing rolls 8 may be positionedrelatively to the blanking die 3 by means of a slotted guide 8X attachedto the cross head 5. The strap may be directed to the rolls 8 by meansof a guide plate 8 (see Fig. 3-11) mounted on casting F G and providedwith grooved rollers 8o adapted to engage the edge of the straps, asshown in Fig. 1l. A similar guide plate may be attached tol-1 the underside of the brackets FG to keep the st-rap in proper position.Preferably the casting FG carrying the strap feeding devices is pivotedto lugs f on brackets F l as shown, so that the strap feeding devicesmay be thrown back out of the Way when it is desired to get to the diesl, 2, 3; and to facilitate the adjusting or repairing of the dies.

Operation-The several mechanisms and parts .thereof are so constructed,and the ac tuating cams and eccentrics so timed, that at each completerevolution of the main shaft a nail is made. The several steps in and adisk or nail head H is blanked therefrom by dies 3 and 2 and forced intodie t2 and against the end of the wire w clamped in die l, the head Hbeing forced onto the end of the wire, which punches its way through thecenter of the head. A further inward movement of the die 3 then pinchesthe head between the convex end lt of die l and the concave end of die3, which impart a concave-convex shape to the nail head. lVhile theparts are in this position the header rod l, which has been following updie 3, is moved farther forward and impinges upon the end of the wireprojecting through the head H and swages the same down upon the head andfirmly rivets the wire to the head. Preferably a slight annular recess lis formed in the outer end of the part lt around the wire groove la, sothat when the header 4 compresses the wire a ridge 7L is formed on theshank under the head, as well as the nut tl outside of the head (seeFigs. 6 7), thus making a very firm and tight joint between the wire andthe head. The header rod 4; and the die 3 then move away from die 2, andabout simultaneously the wire feed comes into operation and moves theheaded end of the wire out toward the retreating die 3 until a length ofwire equal to the desired length of a nailshank has been projectedthrough die 2. Thereupon, while the die 3 and the strap s are clear ofthe headed wire, the pointing and severing dies 6 are actuated so as tocut ott' the headed portion of the wire, which completes the nail; asthe dies 5 point the nail. simultaneously with the severance of the wireafter the wire is severed, it remains at rest-and held by die l-unt-ilanother head H has been attached thereto. Meanwhile the strap feed maybe operated so as to feed in enough of the strap s to bring a freshportion thereof between the dies 2 and 3, so that at the next inwardmovei'nent of the die a new head can bc blanked from the strap andfastened upon the end of the wire in the manner above described. rlhecutting and pointing dies 6 retreat out of the way as the die 3 advancestoward die 2. The above described cycle of operations is performed witheach rotation of the main shaft S and all of them occur in propersequence. By shortening die 3 and elongating the part lt of dies l so asto lill die 2, the machine can be used for forming box strapping.

Having described our invention what we claim as new and desire to secureby Letters Patent is:

l. The combination in a nail making machine, of a wire clamping die, afemale blanking die surrounding the end of the clamping die, and a maleblanking die movable to and from the female die; means for opening andclosing the wire clamping die, and means for operating the male blankingdie.

2. The combination of a wire gripping die composed of opposite part-shaving reduced portions on their inner ends, a blanking die looselyfitted over the reduced portions of the clamping die, and a maleblanking die movable to and from the female blanking die.

3. rlhe combination of a wire gripping die composed of opposite partshaving reduced parti-cylindric portions on their inner ends, an annularblanking die loosely fitted over the cylindrie portions of the clampingdie, and projecting beyond the same; and a male blanking die movable toand from the female blanking die.

et. In a nail making machine the combination of a wire clamping die,fixed and movable blanking dies, means for feeding a wire through theclamping die, means for feeding a strap between the blanking dies acrossthe line of wire feed, and a strap guide movable with the male blankingdie.

5. In a nail making machine the combination of a wire clamping die,fixed and movable blanking dies in axial alinement with the wireclamping die, means for feeding a wire through the clamping die, meansfor feeding a strap between the blanking dies across the line of wirefeed, a strap guide movable with the male blanking die, a header rod,and means for disengaging the perforated strap from the male blankingdie.

6. The combination of a female blanking die, a male blanking die, meansfor feeding a strap between the blanking dies, and a guide for the strapmovable with the male blanking die.

7. In a nail making machine, the combination of a wire clamping die,means for feeding a wire through the clamping die, means for feeding astrap across the line of wire feed, a header rod and a strap guidemovable with the header rod.

In testimony that we claim the foregoing as our own, we aflix oursignatures in presence of two witnesses.

WILLAM H. HART. JOHN E. DOBSON. In presence of- FRANK M. ANDREss, ARTHURE. DownLL.

